Which term refers to the process of digestion?

The term that refers to the process of digestion is derived from the suffix "-pepsia." In medical terminology, "-pepsia" comes from the Greek word "pepsis," which means "digesting" or "digestion." This suffix is commonly used in words related to the digestive process, such as "dyspepsia," which refers to difficult or impaired digestion.

Understanding this, other options don't relate directly to digestion. For instance, "-phage" refers to eating or consuming, often in a cellular context, such as in "macrophage," which is a type of immune cell that engulfs and digests cellular debris. On the other hand, "-palsy" pertains to paralysis or loss of muscular function, and "-phobia" indicates an irrational fear of something. Thus, out of the terms provided, "-pepsia" is the only one that explicitly pertains to the process of digestion.